[AusNOG] The occurrence of duplicate MAC addresses

[Lincoln Dale]

On Fri, Feb 8, 2013 at 6:07 PM, Gavin Tweedie <gav at narx.net> wrote:

>
> Bad luck for guy #2 who rocks up to the peering point with the same MAC as
> an existing member eh? Or potentially bad luck for both if nobody notices
> before they connect.
>

best practice in any peering point is to disallow mac-moves like that - so
should not cause an issue for 1st person with mac-address.

should not be a real problem for the 2nd person either as any clueful
network equipment pretty much allows you to set the mac-address if you so
desire anyway.

  switch#conf t
  switch(config)#int et17
  switch(config-if-Et17)#mac-address ?
    H.H.H  MAC address



>
> An interesting stat to know would be what sort of vendor equipment this is
> occurring on, is it just low end home gateway devices or does the vendor
> have the same issue on higher end gear?
>

i say its a storm in a teacup.
even if its a NIC, you can override the MAC address anyway on just about
anything.


cheers,

lincoln.
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